﻿using System;
using System.Collections.Generic;
using System.Text;
using System.Web;
using System.Runtime.InteropServices;

namespace OgilvyOne.Utility
{
    public class HttpRequestUtil
    {
        public static string GetClientIP()
        {
            string result = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
            if (null == result || result == String.Empty)
            {
                result = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
            }

            if (null == result || result == String.Empty)
            {
                result = HttpContext.Current.Request.UserHostAddress;
            }
            return result;
        }


        [DllImport("Iphlpapi.dll")]
        private static extern int SendARP(Int32 dest, Int32 host, ref Int64 mac, ref Int32 length);
        [DllImport("Ws2_32.dll")]
        private static extern Int32 inet_addr(string ip);

        public static string GetClientMac()
        {
            try
            {
                HttpRequest request = HttpContext.Current.Request;
                string userip = request.UserHostAddress;
                string strClientIP = request.UserHostAddress.ToString().Trim();
                Int32 ldest = inet_addr(strClientIP); //目的地的ip 
                Int32 lhost = inet_addr("");   //本地服务器的ip 
                Int64 macinfo = new Int64();
                Int32 len = 6;
                int res = SendARP(ldest, 0, ref macinfo, ref len);
                string mac_src = macinfo.ToString("X");
                if (mac_src == "0")
                    return null;

                while (mac_src.Length < 12)
                    mac_src = mac_src.Insert(0, "0");

                string mac_dest = "";

                for (int i = 0; i < 11; i++)
                {
                    if (0 == (i % 2))
                    {
                        if (i == 10)
                            mac_dest = mac_dest.Insert(0, mac_src.Substring(i, 2));
                        else
                            mac_dest = "-" + mac_dest.Insert(0, mac_src.Substring(i, 2));
                    }
                }

                return mac_dest;
            }
            catch (Exception err)
            {
                throw new Exception(string.Format("Error occurred in HttpRequestUtil.GetClientMac. Message:{0}", err.Message));
            }
        }
    }
}
